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Finding the Fourth Proportional to 1,662.21, 2,491.70 and 797.13

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Solution

The fourth proportional to 1,662.21, 2,491.70 and 797.13 is: 1,194.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,662.21 : 2,491.70 = 797.13 : x
  2. Step 2: Convert to fraction form
    1,662.21/2,491.70 = 797.13/x
  3. Step 3: Cross multiply
    1,662.21x = 2,491.70 × 797.13
  4. Step 4: Simplify right side
    1,662.21x = 1,986,204.84
  5. Step 5: Solve for x
    x = 1,986,204.84/1,662.21
  6. Step 6: Final answer
    x = 1,194.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.